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Lucene support for Querydsl
/*
* Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.querydsl.lucene4;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.*;
import java.util.regex.Pattern;
import javax.annotation.Nullable;
import org.apache.lucene.index.Term;
import org.apache.lucene.queryparser.classic.QueryParser;
import org.apache.lucene.search.*;
import org.apache.lucene.search.BooleanClause.Occur;
import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.NumericUtils;
import com.google.common.base.Splitter;
import com.google.common.collect.Iterables;
import com.querydsl.core.QueryMetadata;
import com.querydsl.core.types.*;
/**
* Serializes Querydsl queries to Lucene queries.
*
* @author vema
*
*/
public class LuceneSerializer {
private static final Map, SortField.Type> sortFields = new HashMap, SortField.Type>();
static {
sortFields.put(Integer.class, SortField.Type.INT);
sortFields.put(Float.class, SortField.Type.FLOAT);
sortFields.put(Long.class, SortField.Type.LONG);
sortFields.put(Double.class, SortField.Type.DOUBLE);
sortFields.put(Short.class, SortField.Type.SHORT);
sortFields.put(Byte.class, SortField.Type.BYTE);
sortFields.put(BigDecimal.class, SortField.Type.DOUBLE);
sortFields.put(BigInteger.class, SortField.Type.LONG);
}
private static final Splitter WS_SPLITTER = Splitter.on(Pattern.compile("\\s+"));
public static final LuceneSerializer DEFAULT = new LuceneSerializer(false, true);
private final boolean lowerCase;
private final boolean splitTerms;
private final Locale sortLocale;
public LuceneSerializer(boolean lowerCase, boolean splitTerms) {
this(lowerCase, splitTerms, Locale.getDefault());
}
public LuceneSerializer(boolean lowerCase, boolean splitTerms, Locale sortLocale) {
this.lowerCase = lowerCase;
this.splitTerms = splitTerms;
this.sortLocale = sortLocale;
}
private Query toQuery(Operation operation, QueryMetadata metadata) {
Operator op = operation.getOperator();
if (op == Ops.OR) {
return toTwoHandSidedQuery(operation, Occur.SHOULD, metadata);
} else if (op == Ops.AND) {
return toTwoHandSidedQuery(operation, Occur.MUST, metadata);
} else if (op == Ops.NOT) {
BooleanQuery bq = new BooleanQuery();
bq.add(new BooleanClause(toQuery(operation.getArg(0), metadata), Occur.MUST_NOT));
bq.add(new BooleanClause(new MatchAllDocsQuery(), Occur.MUST));
return bq;
} else if (op == Ops.LIKE) {
return like(operation, metadata);
} else if (op == Ops.LIKE_IC) {
throw new IgnoreCaseUnsupportedException();
} else if (op == Ops.EQ) {
return eq(operation, metadata, false);
} else if (op == Ops.EQ_IGNORE_CASE) {
throw new IgnoreCaseUnsupportedException();
} else if (op == Ops.NE) {
return ne(operation, metadata, false);
} else if (op == Ops.STARTS_WITH) {
return startsWith(metadata, operation, false);
} else if (op == Ops.STARTS_WITH_IC) {
throw new IgnoreCaseUnsupportedException();
} else if (op == Ops.ENDS_WITH) {
return endsWith(operation, metadata, false);
} else if (op == Ops.ENDS_WITH_IC) {
throw new IgnoreCaseUnsupportedException();
} else if (op == Ops.STRING_CONTAINS) {
return stringContains(operation, metadata, false);
} else if (op == Ops.STRING_CONTAINS_IC) {
throw new IgnoreCaseUnsupportedException();
} else if (op == Ops.BETWEEN) {
return between(operation, metadata);
} else if (op == Ops.IN) {
return in(operation, metadata, false);
} else if (op == Ops.NOT_IN) {
return notIn(operation, metadata, false);
} else if (op == Ops.LT) {
return lt(operation, metadata);
} else if (op == Ops.GT) {
return gt(operation, metadata);
} else if (op == Ops.LOE) {
return le(operation, metadata);
} else if (op == Ops.GOE) {
return ge(operation, metadata);
} else if (op == LuceneOps.LUCENE_QUERY) {
@SuppressWarnings("unchecked") //this is the expected type
Constant expectedConstant = (Constant) operation.getArg(0);
return expectedConstant.getConstant();
}
throw new UnsupportedOperationException("Illegal operation " + operation);
}
private Query toTwoHandSidedQuery(Operation operation, Occur occur, QueryMetadata metadata) {
Query lhs = toQuery(operation.getArg(0), metadata);
Query rhs = toQuery(operation.getArg(1), metadata);
BooleanQuery bq = new BooleanQuery();
bq.add(createBooleanClause(lhs, occur));
bq.add(createBooleanClause(rhs, occur));
return bq;
}
/**
* If the query is a BooleanQuery and it contains a single Occur.MUST_NOT
* clause it will be returned as is. Otherwise it will be wrapped in a
* BooleanClause with the given Occur.
*/
private BooleanClause createBooleanClause(Query query, Occur occur) {
if (query instanceof BooleanQuery) {
BooleanClause[] clauses = ((BooleanQuery) query).getClauses();
if (clauses.length == 1 && clauses[0].getOccur().equals(Occur.MUST_NOT)) {
return clauses[0];
}
}
return new BooleanClause(query, occur);
}
protected Query like(Operation operation, QueryMetadata metadata) {
verifyArguments(operation);
Path path = getPath(operation.getArg(0));
String field = toField(path);
String[] terms = convert(path, operation.getArg(1));
if (terms.length > 1) {
BooleanQuery bq = new BooleanQuery();
for (String s : terms) {
bq.add(new WildcardQuery(new Term(field, "*" + s + "*")), Occur.MUST);
}
return bq;
}
return new WildcardQuery(new Term(field, terms[0]));
}
protected Query eq(Operation operation, QueryMetadata metadata, boolean ignoreCase) {
verifyArguments(operation);
Path path = getPath(operation.getArg(0));
String field = toField(path);
if (Number.class.isAssignableFrom(operation.getArg(1).getType())) {
@SuppressWarnings("unchecked") //guarded by previous check
Constant rightArg = (Constant) operation.getArg(1);
return new TermQuery(new Term(field, convertNumber(rightArg.getConstant())));
}
return eq(field, convert(path, operation.getArg(1), metadata), ignoreCase);
}
private BytesRef convertNumber(Number number) {
if (Integer.class.isInstance(number) || Byte.class.isInstance(number) || Short.class.isInstance(number)) {
BytesRef bytes = new BytesRef(NumericUtils.BUF_SIZE_INT);
NumericUtils.intToPrefixCoded(number.intValue(), 0, bytes);
return bytes;
} else if (Double.class.isInstance(number) || BigDecimal.class.isInstance(number)) {
BytesRef bytes = new BytesRef(NumericUtils.BUF_SIZE_LONG);
long l = NumericUtils.doubleToSortableLong(number.doubleValue());
NumericUtils.longToPrefixCoded(l, 0, bytes);
return bytes;
} else if (Long.class.isInstance(number) || BigInteger.class.isInstance(number)) {
BytesRef bytes = new BytesRef(NumericUtils.BUF_SIZE_LONG);
NumericUtils.longToPrefixCoded(number.longValue(), 0, bytes);
return bytes;
} else if (Float.class.isInstance(number)) {
BytesRef bytes = new BytesRef(NumericUtils.BUF_SIZE_INT);
int i = NumericUtils.floatToSortableInt(number.floatValue());
NumericUtils.intToPrefixCoded(i, 0, bytes);
return bytes;
} else {
throw new IllegalArgumentException("Unsupported numeric type "
+ number.getClass().getName());
}
}
protected Query eq(String field, String[] terms, boolean ignoreCase) {
if (terms.length > 1) {
PhraseQuery pq = new PhraseQuery();
for (String s : terms) {
pq.add(new Term(field, s));
}
return pq;
}
return new TermQuery(new Term(field, terms[0]));
}
protected Query in(Operation operation, QueryMetadata metadata, boolean ignoreCase) {
Path path = getPath(operation.getArg(0));
String field = toField(path);
@SuppressWarnings("unchecked") //this is the expected type
Constant> expectedConstant = (Constant>) operation.getArg(1);
Collection values = expectedConstant.getConstant();
BooleanQuery bq = new BooleanQuery();
if (Number.class.isAssignableFrom(path.getType())) {
for (Object value : values) {
TermQuery eq = new TermQuery(new Term(field, convertNumber((Number) value)));
bq.add(eq, Occur.SHOULD);
}
} else {
for (Object value : values) {
String[] str = convert(path, value);
bq.add(eq(field, str, ignoreCase), Occur.SHOULD);
}
}
return bq;
}
protected Query notIn(Operation operation, QueryMetadata metadata, boolean ignoreCase) {
BooleanQuery bq = new BooleanQuery();
bq.add(new BooleanClause(in(operation, metadata, false), Occur.MUST_NOT));
bq.add(new BooleanClause(new MatchAllDocsQuery(), Occur.MUST));
return bq;
}
protected Query ne(Operation operation, QueryMetadata metadata, boolean ignoreCase) {
BooleanQuery bq = new BooleanQuery();
bq.add(new BooleanClause(eq(operation, metadata, ignoreCase), Occur.MUST_NOT));
bq.add(new BooleanClause(new MatchAllDocsQuery(), Occur.MUST));
return bq;
}
protected Query startsWith(QueryMetadata metadata, Operation operation, boolean ignoreCase) {
verifyArguments(operation);
Path path = getPath(operation.getArg(0));
String field = toField(path);
String[] terms = convertEscaped(path, operation.getArg(1), metadata);
if (terms.length > 1) {
BooleanQuery bq = new BooleanQuery();
for (int i = 0; i < terms.length; ++i) {
String s = i == 0 ? terms[i] + "*" : "*" + terms[i] + "*";
bq.add(new WildcardQuery(new Term(field, s)), Occur.MUST);
}
return bq;
}
return new PrefixQuery(new Term(field, terms[0]));
}
protected Query stringContains(Operation operation, QueryMetadata metadata, boolean ignoreCase) {
verifyArguments(operation);
Path path = getPath(operation.getArg(0));
String field = toField(path);
String[] terms = convertEscaped(path, operation.getArg(1), metadata);
if (terms.length > 1) {
BooleanQuery bq = new BooleanQuery();
for (String s : terms) {
bq.add(new WildcardQuery(new Term(field, "*" + s + "*")), Occur.MUST);
}
return bq;
}
return new WildcardQuery(new Term(field, "*" + terms[0] + "*"));
}
protected Query endsWith(Operation operation, QueryMetadata metadata, boolean ignoreCase) {
verifyArguments(operation);
Path path = getPath(operation.getArg(0));
String field = toField(path);
String[] terms = convertEscaped(path, operation.getArg(1), metadata);
if (terms.length > 1) {
BooleanQuery bq = new BooleanQuery();
for (int i = 0; i < terms.length; ++i) {
String s = i == terms.length - 1 ? "*" + terms[i] : "*" + terms[i] + "*";
bq.add(new WildcardQuery(new Term(field, s)), Occur.MUST);
}
return bq;
}
return new WildcardQuery(new Term(field, "*" + terms[0]));
}
protected Query between(Operation operation, QueryMetadata metadata) {
verifyArguments(operation);
Path path = getPath(operation.getArg(0));
// TODO Phrase not properly supported
return range(
path,
toField(path),
operation.getArg(1),
operation.getArg(2),
true,
true,
metadata);
}
protected Query lt(Operation operation, QueryMetadata metadata) {
verifyArguments(operation);
Path path = getPath(operation.getArg(0));
return range(
path,
toField(path),
null,
operation.getArg(1),
false,
false,
metadata);
}
protected Query gt(Operation operation, QueryMetadata metadata) {
verifyArguments(operation);
Path path = getPath(operation.getArg(0));
return range(
path,
toField(path),
operation.getArg(1),
null,
false,
false,
metadata);
}
protected Query le(Operation operation, QueryMetadata metadata) {
verifyArguments(operation);
Path path = getPath(operation.getArg(0));
return range(
path,
toField(path),
null,
operation.getArg(1),
true,
true,
metadata);
}
protected Query ge(Operation operation, QueryMetadata metadata) {
verifyArguments(operation);
Path path = getPath(operation.getArg(0));
return range(
path,
toField(path),
operation.getArg(1),
null,
true,
true,
metadata);
}
protected Query range(Path leftHandSide, String field, @Nullable Expression min,
@Nullable Expression max, boolean minInc, boolean maxInc, QueryMetadata metadata) {
if (min != null && Number.class.isAssignableFrom(min.getType()) || max != null
&& Number.class.isAssignableFrom(max.getType())) {
@SuppressWarnings("unchecked") //guarded by previous check
Constant minConstant = (Constant) min;
@SuppressWarnings("unchecked") //guarded by previous check
Constant maxConstant = (Constant) max;
Class numType = minConstant != null ? minConstant.getType() : maxConstant.getType();
//this is not necessarily safe, but compile time checking
//on the user side mandates these types to be interchangeable
@SuppressWarnings("unchecked")
Class unboundedNumType = (Class) numType;
return numericRange(unboundedNumType, field, minConstant == null ? null
: minConstant.getConstant(), maxConstant == null ? null
: maxConstant.getConstant(), minInc, maxInc);
}
return stringRange(leftHandSide, field, min, max, minInc, maxInc, metadata);
}
protected NumericRangeQuery numericRange(Class clazz, String field,
@Nullable N min, @Nullable N max, boolean minInc, boolean maxInc) {
if (clazz.equals(Integer.class)) {
return NumericRangeQuery.newIntRange(field, (Integer) min, (Integer) max, minInc, maxInc);
} else if (clazz.equals(Double.class)) {
return NumericRangeQuery.newDoubleRange(field, (Double) min, (Double) max, minInc, minInc);
} else if (clazz.equals(Float.class)) {
return NumericRangeQuery.newFloatRange(field, (Float) min, (Float) max, minInc, minInc);
} else if (clazz.equals(Long.class)) {
return NumericRangeQuery.newLongRange(field, (Long) min, (Long) max, minInc, minInc);
} else if (clazz.equals(Byte.class) || clazz.equals(Short.class)) {
return NumericRangeQuery.newIntRange(field, min != null ? min.intValue() : null,
max != null ? max.intValue() : null, minInc, maxInc);
} else {
throw new IllegalArgumentException("Unsupported numeric type " + clazz.getName());
}
}
protected Query stringRange(
Path leftHandSide,
String field,
@Nullable Expression min,
@Nullable Expression max,
boolean minInc,
boolean maxInc,
QueryMetadata metadata) {
if (min == null) {
return TermRangeQuery.newStringRange(
field, null, convert(leftHandSide, max, metadata)[0], minInc, maxInc);
} else if (max == null) {
return TermRangeQuery.newStringRange(
field, convert(leftHandSide, min, metadata)[0],
null, minInc, maxInc);
} else {
return TermRangeQuery.newStringRange(
field, convert(leftHandSide, min, metadata)[0],
convert(leftHandSide, max, metadata)[0],
minInc, maxInc);
}
}
private Path getPath(Expression leftHandSide) {
if (leftHandSide instanceof Path) {
return (Path) leftHandSide;
} else if (leftHandSide instanceof Operation) {
Operation operation = (Operation) leftHandSide;
if (operation.getOperator() == Ops.LOWER || operation.getOperator() == Ops.UPPER) {
return (Path) operation.getArg(0);
}
}
throw new IllegalArgumentException("Unable to transform " + leftHandSide + " to path");
}
/**
* template method, override to customize
*
* @param path path
* @return field name
*/
protected String toField(Path path) {
PathMetadata md = path.getMetadata();
if (md.getPathType() == PathType.COLLECTION_ANY) {
return toField(md.getParent());
} else {
String rv = md.getName();
if (md.getParent() != null) {
Path parent = md.getParent();
if (parent.getMetadata().getPathType() != PathType.VARIABLE) {
rv = toField(parent) + "." + rv;
}
}
return rv;
}
}
private void verifyArguments(Operation operation) {
List> arguments = operation.getArgs();
for (int i = 1; i < arguments.size(); ++i) {
if (!(arguments.get(i) instanceof Constant)
&& !(arguments.get(i) instanceof ParamExpression)
&& !(arguments.get(i) instanceof PhraseElement)
&& !(arguments.get(i) instanceof TermElement)) {
throw new IllegalArgumentException("operand was of unsupported type "
+ arguments.get(i).getClass().getName());
}
}
}
/**
* template method
*
* @param leftHandSide left hand side
* @param rightHandSide right hand side
* @return results
*/
protected String[] convert(Path leftHandSide, Expression rightHandSide, QueryMetadata metadata) {
if (rightHandSide instanceof Operation) {
Operation operation = (Operation) rightHandSide;
if (operation.getOperator() == LuceneOps.PHRASE) {
return Iterables.toArray(WS_SPLITTER.split(operation.getArg(0).toString()), String.class);
} else if (operation.getOperator() == LuceneOps.TERM) {
return new String[] {operation.getArg(0).toString()};
} else {
throw new IllegalArgumentException(rightHandSide.toString());
}
} else if (rightHandSide instanceof ParamExpression) {
Object value = metadata.getParams().get(rightHandSide);
if (value == null) {
throw new ParamNotSetException((ParamExpression) rightHandSide);
}
return convert(leftHandSide, value);
} else if (rightHandSide instanceof Constant) {
return convert(leftHandSide, ((Constant) rightHandSide).getConstant());
} else {
throw new IllegalArgumentException(rightHandSide.toString());
}
}
/**
* template method
*
* @param leftHandSide left hand side
* @param rightHandSide right hand side
* @return results
*/
protected String[] convert(Path leftHandSide, Object rightHandSide) {
String str = rightHandSide.toString();
if (lowerCase) {
str = str.toLowerCase();
}
if (splitTerms) {
if (str.equals("")) {
return new String[] {str};
} else {
return Iterables.toArray(WS_SPLITTER.split(str), String.class);
}
} else {
return new String[] {str};
}
}
private String[] convertEscaped(Path leftHandSide, Expression rightHandSide, QueryMetadata metadata) {
String[] str = convert(leftHandSide, rightHandSide, metadata);
for (int i = 0; i < str.length; i++) {
str[i] = QueryParser.escape(str[i]);
}
return str;
}
public Query toQuery(Expression expr, QueryMetadata metadata) {
if (expr instanceof Operation) {
return toQuery((Operation) expr, metadata);
} else {
return toQuery(ExpressionUtils.extract(expr), metadata);
}
}
public Sort toSort(List> orderBys) {
List sorts = new ArrayList(orderBys.size());
for (OrderSpecifier order : orderBys) {
if (!(order.getTarget() instanceof Path)) {
throw new IllegalArgumentException("argument was not of type Path.");
}
Class type = order.getTarget().getType();
boolean reverse = !order.isAscending();
Path path = getPath(order.getTarget());
if (Number.class.isAssignableFrom(type)) {
sorts.add(new SortField(toField(path), sortFields.get(type), reverse));
} else {
sorts.add(new SortField(toField(path), SortField.Type.STRING, reverse));
}
}
Sort sort = new Sort();
sort.setSort(sorts.toArray(new SortField[sorts.size()]));
return sort;
}
}